Small body size increases the regional differentiation of populations of tropical mantellid frogs (Anura: Mantellidae)
Small body size increases the regional differentiation of populations of tropical mantellid frogs (Anura: Mantellidae)
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体型较小增加了热带螳螂种群的区域分化（无尾：螳螂科）
DOI：
10.1111/j.1420-9101.2012.02613.x
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发表时间：
2012
影响因子：
2.1
通讯作者：
中科院分区：
文献类型：
--
作者：
影响物种多样化的进程也可能对物种内遗传变异的模式产生影响。我们评估了5个变量的贡献可能影响分支多样化（身体大小，生殖方式，范围大小，微生境和皮肤纹理）的mtDNA的分歧和多态性之间的40种青蛙（Mantellidae）在马达加斯加的两个雨林社区的人口。我们报告了一个负相关的身体大小和种群之间的核苷酸分歧，但没有发现其他变量对遗传变异的影响。身体的大小解释CA。11%的群体之间的核苷酸差异的变化，加上高FST水平和缺乏单倍型共享的小型和中型青蛙。低扩散能力可能是小地幔中高种群分化的直接机制。种群间遗传凝聚力的缺乏建立了区域遗传片段化，这反过来又有可能加速小青蛙相对于大物种的异域物种形成速率。然而，几乎没有证据表明这些或其他小型生物的物种形成率增加。我们调和这些相互矛盾的意见表明，较低的扩散能力也抑制了新的领域的殖民化，减速弱分散的多样化。我们的研究结果意味着，中间扩散模型也适用于两栖动物，并可能解释不一致的身体大小和物种形成率的相关性以前的结果。
The processes affecting species diversification may also exert an influence on patterns of genetic variability within species. We evaluated the contributions of five variables potentially influencing clade diversification (body size, reproductive mode, range size, microhabitat and skin texture) on mtDNA divergence and polymorphism among populations of 40 species of frogs (Mantellidae) from two rainforest communities in Madagascar. We report an inverse association between body size and nucleotide divergence between populations but find no influence of other variables on genetic variation. Body size explained ca. 11% of the variation in nucleotide divergence between populations and was coupled with highFSTlevels and an absence of haplotype sharing in small‐bodied and medium‐sized frogs. Low dispersal ability is likely the proximate mechanism producing higher population differentiation in small mantellids. The lack of genetic cohesion among populations establishes regional genetic fragmentation which in turn has the potential to accelerate rates of allopatric speciation in small frogs relative to large species. However, there is little evidence of increased speciation rates in these or other small‐bodied organisms. We reconcile these contradictory observations by suggesting that lower dispersal ability also curbs colonization of new areas, decelerating diversification in weak dispersers. Our results imply that the intermediate dispersal model also applies to amphibians and may explain inconsistent previous results on the correlation of body size and speciation rate.
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